John wood



(No Model.)

J. WOO-D.

' PIPE DRAWING TONGS.

Nd. 576,179. Patented Feb. 2, 1897.

llnrrnn STATES ATENT Ormcn.

JOHN \VOOD, OF MIDDLETOIVN, PENNSYLVANIA, ASSIGNOR TO A. S. MATI-IESON AND R. C. NEAL, RECEIVERS .OF THE AMERICAN TUBE AND IRON COMPANY.

PIPE-DRAWING TONGS.

SPECIFICATION forming part of Letters Patent No. 576,179, dated February 2, 1897.

Application filed June 11,1896. Serial No. 595,169. (No model.)

To all whom it may concern:

Be it known that 1, JOHN VVOOD, a citizen of the United States, residing at Middletown, in the county of Dauphin and State of Pennsylvania, have invented a certain new and useful Improvement in Pipe-Drawing Tongs, of which the following is a specification, reference being had to the accompanying drawings.

This improvement relates to that class of tools to be used in the manufacture of buttwelded pipe for drawing a skelp through bells in forming a pipe; and the invention consists in the peculiar construction and arrangement of parts hereinafter described and then definitely pointed outin the claims at the end hereof.

Referring now to the drawings which illustrate the preferable ways of carrying out my invention, Figure 1 represents a side elevation of my skelp-tongs with the jaws closed. Fig. 2 is a similar view with the jaws opened. Fig. 3 is an enlarged detail of the jaw end. Fig. 4. is a side elevation of a modification.

Referring to the details of said figures by letters, A represents the body of my tongs, with one end formed into a jaw 13 and the other end into a tube D, through which works an operating-rod E, which has ahead 6 form ed on the end thereof. Projecting from near the rear end of this jaw B is an ear 1), (shown in dotted lines in Figs. 1 and 2,) which forms a bearing for a jaw O, which is pivoted to said ear I) by a pivotal pin 0. These jaws B and O are formed with teeth I) and c, as clearly shown in Fig. 2, and are also formed so as to leave a V-shaped recess between their ends when closed, for a purpose to be described farther 011.

Projecting from the jaw O is an extended portion or arm F, and this arm F is pivoted to a sliding link G, which link is also pivoted to the rod E before mentioned. The said'link G is slotted at g, and through this slot extends a bolt g, onwhich the said link slides.

The rod E, which has ,been mentioned as being pivoted to the sliding link G, extends rearwardly and operates through the tube end D of the body portion of the tongs and has an operating-head 6 formed thereon.

In Fig. 6, instead of using the slotted link G shown in Figs. 1 and 2, I have provided a sliding link G, which works through a lug g pivotally secured to the body of the tongs. The other parts of this tong are identical with those shown in Figs. 1 and 2, and I consider the sliding link and projecting lug as equivalent to the construction shown in Figs. 1 and 2, as the parts 9 and g" both form fulcrums for the link connecting the rod E with the arm F.

The operation is as follows: The tongs are moved toward the skelp, and as thewalls of the V-shaped recess of the jaws'strike said skelp said jaws are forced open in the act of forcing the tongs forward, and when the jaws are entirely over the skelp the operating mechanism is connected to the head 6 of the rod E and draws on said parts, which, acting on the sliding link and extended arm of the movable jaw, causes the jaws to firmly grip the skelp and, as the mechanism continues to act, to draw said skelp through the bells and thus form the pipe, in a manner well understood. It is easily seen that the more force that is brought to bear in pulling the head 6 the more gripping power the jaws have, as the act of drawing on the rod and its sliding link only causes the jaws to attempt to come closer together.

From the foregoing it will be seen I have constructed a pair of very compact tongs, and it is absolutely necessary to have them compact in order to properly enable the tongs and its skelp to be drawn through the bells, and also that my tongs will grip the skelp proportionately to the force that is exerted in pul1- ing the tongs and their skelp through the bells. This last feature is most essential, for the tendency of the skelp to slip out of the jaws of the tong is increased as the said skelp is being formed into tube shape by being drawn through the bells.

What I claim as new is 1. In a pair of tongs, a body having a jaw projecting therefrom, a second jaw pivoted thereto, a sliding link fulcrum ed 011 said body pivotally connected with said second jaw and an operating-rod pivotally connected with said link, substantially as described.

2. I11 a pair of tongs, a body having a jaw projecting therefrom, a second jaw pivoted thereto, a sliding link connected with said body by a fulcrum-bearing, and an arm projecting from said second jaw and having a pivotal connection with said sliding link, and an operating-rod pivotally connected with said sliding link, substantially as described.

3. In a pair of tongs, a body having a jaw projecting therefrom, a second jaw pivoted thereto and having an arm extending therefrom, an operating-bar, and a sliding link pivotally connecting said arm and bar, the said link having a slot therein through which pro- JOHN VOOD.

Vitnosses:

JOSEPH H. Wool), JAs. H. MATHESON. 

